US4706687A - Linear suction control system - Google Patents
Linear suction control system Download PDFInfo
- Publication number
- US4706687A US4706687A US06/706,654 US70665485A US4706687A US 4706687 A US4706687 A US 4706687A US 70665485 A US70665485 A US 70665485A US 4706687 A US4706687 A US 4706687A
- Authority
- US
- United States
- Prior art keywords
- signal
- vacuum
- valve
- control system
- solenoid valve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M1/00—Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
- A61M1/71—Suction drainage systems
- A61M1/74—Suction control
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B2017/00973—Surgical instruments, devices or methods, e.g. tourniquets pedal-operated
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M1/00—Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
- A61M1/80—Suction pumps
- A61M1/804—Suction pumps using Laval or Venturi jet pumps
Definitions
- Some suction systems deliver vacuum to a surgical handpiece, and provide a series of leak ports adapted to be blocked or unblocked by one or more of the fingers of the hand wielding the handpiece.
- the surgeon may slide a finger along the row of ports to unblock ports and thus set a limited number of vacuum suction levels.
- This pressure control is not continuous, being limited to a few discrete levels, and even these levels can be set only within a broad range.
- introducing a series of leaks is inherently inefficient and wasteful.
- the present invention generally comprises a vacuum or negative pressure delivery system which features precise, continuously variable, predictable control of the vacuum delivered.
- a significant feature is that the variation in vacuum may be adjusted electronically to follow any desirable functional mathematical relationship to a control signal.
- the system may be arranged so that the vacuum level will vary linearly with respect to the position of a control lever, pedal, or the like. The vacuum does not fluctuate wildly, and the vacuum at any position of the control lever or pedal is predictable and reproducible.
- the system may be adapted to surgical suction/evacuation systems and the like, as well as to other technical disciplines.
- the linear suction control system includes a linear solenoid valve which exhibits a flow through rate which varies with respect to the current through the solenoid in a known manner. Regulated fluid pressure is fed through the linear solenoid valve to a venturi-type pressure vacuum converter. The resulting vacuum is proportional to the flow rate through the valve and thus to a function of the current through the solenoid.
- a transducer samples the vacuum output and produces a signal fed to a differential amplifier. The signal is compared with a variable input voltage set by a potentiometer or other variable voltage source in negative feedback fashion, so that the transducer signal tracks the voltage source signal by actuating the valve to correct the flow rate so that the desired pressure will be attained.
- the voltage source may comprise a potentiometer actuated by a foot switch or the like, so that angular position of the foot switch relates directly and predictably to the vacuum output.
- the linear solenoid valve includes an electromagnetic coil arranged to drive a valve member, with an elastic member biasing the valve member closed with a generally linear restoring force.
- the circuitry of the differential amplifier may be arranged so that the overall relationship of the vacuum level to the controller position may follow any desired function. Thus the response to a control device may be tailored to suit the user, the process to which the vacuum is applied, or the like.
- FIG. 1 is a functional block diagram of the vacuum control and delivery system of the present invention.
- FIG. 2 is a cross-sectional elevation of the linear solenoid valve according to the present invention.
- FIG. 3 is a schematic represenation of the linear solenoid valve depicted in FIG. 2.
- the present invention generally comprises a vacuum (negative gauge pressure) delivery system which features fine control of the vacuum which is generated and delivered.
- the system includes a novel linear solenoid valve 11.
- the linear solenoid valve is an electrically actuated valve which exhibits a through-flow rate proportional to the current through the solenoid coil, as will be explained in the following.
- a regulated fluid pressure supply 12 is fed through the linear solenoid valve 11 to a converter 13 which converts positive fluid pressure to a corresponding vacuum (negative pressure).
- One such device manufactured by Air-Vac Co., utilizes a venturi restriction in the flow path of the pressurized fluid to generate a partial vacuum.
- the partial vacuum (negative gauge pressure) is proportional to the flow rate of the pressurized fluid through the converter 13.
- the resulting partial vacuum output 14 may be connected to any device requiring negative pressure, such as a surgical cutting device, suction/evacuation device, or the like.
- a transducer 16 is connected to the output 14 to sample the negative pressure level of the output.
- the transducer 16 generates a signal which is fed to a differential amplifier 17.
- the differential amplifier 17 is also fed a reference signal generated by a variable voltage device, such as the potentiometer 18.
- the potentiometer is actuated by a control device, such as a foot pedal controller 19 having a continuously variable range of angular position settings which are directly related to the potentiometer setting.
- a control device such as a foot pedal controller 19 having a continuously variable range of angular position settings which are directly related to the potentiometer setting.
- other reference voltage sources may be employed, such as a microprocessor system in which the pedal position of the device 19 is read by a linear shaft position encoder, and the pedal position is correlated with the desired voltage level by a look-up table stored in the system memory.
- the differential amplifier 17 is configured to compare the transducer signal with the reference voltage level, and to produce a difference output which is provided to adder 20. Further the original reference voltage signal from foot pedal controller 19 is provided to adder 20. These two signals are added together by adder 20 and drive the linear solenoid valve in typical feedback loop fashion. If the signal from transducer 16 is different from that from controller 19, the difference will be combined with the signal from controller 19 to cause the vacuum at output 14 to track the level set by controller 19. If the difference between the signals provided to differential amplifier 17 is zero, only the signal from controller 19 is provided to adder 20 and the vacuum output at 14 is at the desired level set by controller 19.
- the differential amplifier circuitry is configured to produce a system in which the vacuum level is directly related to the position of the pedal of the controller 19.
- This overall system response may be configured as linear, in which incremental change in pedal position divided by incremental change in negative pressure level results in a constant number.
- the system of the present invention may be configured to have a particular non-linear response, as may be required by the end user of the system.
- the negative pressure delivery system of the present invention does not employ the standard pressure accumulator tank, and thus has no large volumes which typically slow the response of a partial vacuum system.
- the prior art problem of overshooting the desired pressure level in reaching steady state in the accumulator tank is obviated.
- the construction of the linear solenoid valve 11 includes a solenoid coil 32 wound about a hollow tubular member 33.
- One end of the tubular member 33 is sealed by a plug 34, and the stem of a valve member 36 is slidably received in the other end portion of the member 33.
- a significant feature of the invention is the provision of an elastic member 35 disposed between the plug 34 and the valve stem 36 to bias the latter member outwardly of the tube 33.
- the member 35 may comprise elastomeric rubber, foamed plastic, or the like, and it exhibits a restoring force which varies linearly with the amount of compression applied thereto.
- a valve head member 37 is secured at the open end of the tube 33, and includes a valve seat 38 adapted to receive the distal end of the valve stem 36.
- a collar 39 is secured to the member 37 by threads, and an O-ring seal 21 retains pressure in the assembly.
- a valve port member 22 is joined to the collar, and includes an inlet port 23 and an outlet port 24. The flow path between the inlet and outlet includes an orifice 26 which is selectively and variably opened by the valve member 36. The magnetic force generated by the solenoid coil 32 drives the valve stem 36 toward the plug 34, thus opening the orifice 26.
- the elastic member also provides a damping effect to the motion of the valve stem, and thus is superior to a metal spring or the like.
- the material of the elastic member is generally serviceable through approximately one billion operating cycles.
Abstract
Description
Claims (20)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US06/706,654 US4706687A (en) | 1985-02-28 | 1985-02-28 | Linear suction control system |
US07/107,971 US4838281A (en) | 1985-02-28 | 1987-10-13 | Linear suction control system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US06/706,654 US4706687A (en) | 1985-02-28 | 1985-02-28 | Linear suction control system |
Publications (1)
Publication Number | Publication Date |
---|---|
US4706687A true US4706687A (en) | 1987-11-17 |
Family
ID=24838518
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US06/706,654 Expired - Lifetime US4706687A (en) | 1985-02-28 | 1985-02-28 | Linear suction control system |
Country Status (1)
Country | Link |
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US (1) | US4706687A (en) |
Cited By (93)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4795428A (en) * | 1987-03-30 | 1989-01-03 | Hwang Shyh Chyi | Therapeutic suction device |
US4988336A (en) * | 1989-09-22 | 1991-01-29 | Allied Healthcare Products, Inc. | Electronic suction regulator |
US5094260A (en) * | 1990-10-26 | 1992-03-10 | Alcon Surgical, Inc. | Proportional valve and pressure control system |
US5157603A (en) * | 1986-11-06 | 1992-10-20 | Storz Instrument Company | Control system for ophthalmic surgical instruments |
US5230625A (en) * | 1991-03-28 | 1993-07-27 | Siemens Aktiengesellschaft | Valve arrangement |
US5242404A (en) * | 1992-02-12 | 1993-09-07 | American Cyanamid Company | Aspiration control system |
US5354268A (en) * | 1992-11-04 | 1994-10-11 | Medical Instrument Development Laboratories, Inc. | Methods and apparatus for control of vacuum and pressure for surgical procedures |
US5380280A (en) * | 1993-11-12 | 1995-01-10 | Peterson; Erik W. | Aspiration system having pressure-controlled and flow-controlled modes |
US5419768A (en) * | 1991-03-07 | 1995-05-30 | Aeros Instruments, Inc. | Electrical medical vacuum regulator |
US5549139A (en) * | 1989-10-27 | 1996-08-27 | Storz Instrument Company | Pneumatic controls for ophthalmic surgical system |
US5584824A (en) * | 1994-06-08 | 1996-12-17 | Syntec, Inc. | Controlled vacuum cassette in ophthalmic retinal surgery |
US5624394A (en) * | 1994-10-28 | 1997-04-29 | Iolab Corporation | Vacuum system and a method of operating a vacuum system |
US5674194A (en) * | 1995-10-25 | 1997-10-07 | Alcon Laboratories Inc. | Process control system |
US5810766A (en) * | 1995-02-28 | 1998-09-22 | Chiron Vision Corporation | Infusion/aspiration apparatus with removable cassette |
NL1006001C2 (en) * | 1997-05-07 | 1998-11-10 | Europ Medical Contract Manufac | Vacuum assisted system for draining wounds |
US5833643A (en) * | 1996-06-07 | 1998-11-10 | Scieran Technologies, Inc. | Apparatus for performing ophthalmic procedures |
US5910139A (en) * | 1996-08-29 | 1999-06-08 | Storz Instrument Co. | Numeric keypad simulated on touchscreen |
US5997528A (en) * | 1996-08-29 | 1999-12-07 | Bausch & Lomb Surgical, Inc. | Surgical system providing automatic reconfiguration |
US6055458A (en) * | 1997-08-28 | 2000-04-25 | Bausch & Lomb Surgical, Inc. | Modes/surgical functions |
US6086576A (en) * | 1996-08-29 | 2000-07-11 | Bausch & Lomb Surgical, Inc. | Automatically switching the termination of a communications bus |
US6117126A (en) * | 1996-08-29 | 2000-09-12 | Bausch & Lomb Surgical, Inc. | Surgical module with independent microprocessor-based communication |
US6179829B1 (en) | 1997-08-28 | 2001-01-30 | Bausch & Lomb Surgical, Inc. | Foot controller for microsurgical system |
US6251113B1 (en) | 1996-08-29 | 2001-06-26 | Bausch & Lomb Surgical, Inc. | Ophthalmic microsurgical system employing surgical module employing flash EEPROM and reprogrammable modules |
US6258111B1 (en) | 1997-10-03 | 2001-07-10 | Scieran Technologies, Inc. | Apparatus and method for performing ophthalmic procedures |
US6358260B1 (en) | 1998-04-20 | 2002-03-19 | Med-Logics, Inc. | Automatic corneal shaper with two separate drive mechanisms |
US6425905B1 (en) | 2000-11-29 | 2002-07-30 | Med-Logics, Inc. | Method and apparatus for facilitating removal of a corneal graft |
US6428508B1 (en) | 2000-02-01 | 2002-08-06 | Enlighten Technologies, Inc. | Pulsed vacuum cataract removal system |
US6478781B1 (en) | 2000-04-11 | 2002-11-12 | Circuit Tree Medical, Inc. | Anterior chamber stabilizing device for use in eye surgery |
US6547775B1 (en) | 1998-10-22 | 2003-04-15 | Medtronic, Inc. | Atraumatic blood suction system |
US6663644B1 (en) | 2000-06-02 | 2003-12-16 | Med-Logics, Inc. | Cutting blade assembly for a microkeratome |
US6699285B2 (en) | 1999-09-24 | 2004-03-02 | Scieran Technologies, Inc. | Eye endoplant for the reattachment of a retina |
US6702832B2 (en) | 1999-07-08 | 2004-03-09 | Med Logics, Inc. | Medical device for cutting a cornea that has a vacuum ring with a slitted vacuum opening |
US20060027235A1 (en) * | 2004-08-03 | 2006-02-09 | Orwig Steven J | Compensating venturi vacuum system |
EP1757317A1 (en) * | 2005-08-25 | 2007-02-28 | Ohio Medical Corporation | Compensating venturi vacuum system |
US7311700B2 (en) | 2000-11-29 | 2007-12-25 | Med-Logics, Inc. | LASIK laminar flow system |
US20080142093A1 (en) * | 2006-12-13 | 2008-06-19 | Alcon, Inc. | Adjustable Pneumatic System for a Surgical Machine |
US20080146988A1 (en) * | 2006-12-15 | 2008-06-19 | Alcon, Inc. | Pressure Monitor for Pneumatic Vitrectomy Machine |
US20080149197A1 (en) * | 2006-12-21 | 2008-06-26 | Denis Turner | Pneumatic system for a vitrector |
US20080168985A1 (en) * | 2006-10-30 | 2008-07-17 | Denis Turner | Gas Pressure Monitor for Pneumatic Surgical Machine |
US20080287826A1 (en) * | 2004-07-09 | 2008-11-20 | Bard Peripheral Vasular, Inc. | Transport System for Biopsy Device |
US20090082715A1 (en) * | 2007-09-21 | 2009-03-26 | Charles Steven T | System and Method For Actuation of A Vitreous Cutter |
US20100106053A1 (en) * | 2006-10-06 | 2010-04-29 | Videbaek Karsten | Tissue handling system with reduced operator exposure |
US20110054508A1 (en) * | 2009-08-31 | 2011-03-03 | Jiansheng Zhou | Pneumatic Pressure Output Control by Drive Valve Duty Cycle Calibration |
US20110054350A1 (en) * | 2009-09-01 | 2011-03-03 | Videbaek Karsten | Biopsy apparatus having a tissue sample retrieval mechanism |
US20110087131A1 (en) * | 2009-10-12 | 2011-04-14 | Videbaek Karsten | Biopsy probe assembly having a mechanism to prevent misalignment of components prior to installation |
US20110092887A1 (en) * | 2008-11-07 | 2011-04-21 | Abbott Medical Optics Inc. | Method for programming foot pedal settings and controlling performance through foot pedal variation |
US20110098721A1 (en) * | 2008-11-07 | 2011-04-28 | Abbott Medical Optics Inc. | Adjustable foot pedal control for ophthalmic surgery |
US20110105946A1 (en) * | 2009-10-31 | 2011-05-05 | Sorensen Peter L | Biopsy system with infrared communications |
US20110144813A1 (en) * | 2009-12-10 | 2011-06-16 | Daryush Agahi | Systems and Methods for Dynamic FeedForward |
US20110208085A1 (en) * | 2005-01-31 | 2011-08-25 | C.R. Bard, Inc. | Quick cycle biopsy system |
US20120289915A1 (en) * | 2005-07-14 | 2012-11-15 | Boehringer Laboratories, L.P. | System for treating a wound with suction and method of detecting a loss of suction |
US8565839B2 (en) | 2005-10-13 | 2013-10-22 | Abbott Medical Optics Inc. | Power management for wireless devices |
US8597205B2 (en) | 2007-12-20 | 2013-12-03 | C. R. Bard, Inc. | Biopsy device |
US8690793B2 (en) | 2009-03-16 | 2014-04-08 | C. R. Bard, Inc. | Biopsy device having rotational cutting |
US8708930B2 (en) | 2009-04-15 | 2014-04-29 | Bard Peripheral Vascular, Inc. | Biopsy apparatus having integrated fluid management |
US8721563B2 (en) | 2005-08-10 | 2014-05-13 | C. R. Bard, Inc. | Single-insertion, multiple sample biopsy device with integrated markers |
US8728004B2 (en) | 2003-03-29 | 2014-05-20 | C.R. Bard, Inc. | Biopsy needle system having a pressure generating unit |
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US8808318B2 (en) | 2011-02-28 | 2014-08-19 | Alcon Research, Ltd. | Surgical probe with increased fluid flow |
US8808197B2 (en) | 2009-10-29 | 2014-08-19 | Bard Peripheral Vascular, Inc. | Biopsy driver assembly having a control circuit for conserving battery power |
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US9060841B2 (en) | 2011-08-31 | 2015-06-23 | Alcon Research, Ltd. | Enhanced flow vitrectomy probe |
US9072502B2 (en) | 2002-03-19 | 2015-07-07 | C. R. Bard, Inc. | Disposable biopsy unit |
US9133835B2 (en) | 2008-11-07 | 2015-09-15 | Abbott Medical Optics Inc. | Controlling of multiple pumps |
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Cited By (191)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5157603A (en) * | 1986-11-06 | 1992-10-20 | Storz Instrument Company | Control system for ophthalmic surgical instruments |
US5455766A (en) * | 1986-11-06 | 1995-10-03 | Storz Instrument Company | Control system for ophthalmic surgical instruments |
US4795428A (en) * | 1987-03-30 | 1989-01-03 | Hwang Shyh Chyi | Therapeutic suction device |
US4988336A (en) * | 1989-09-22 | 1991-01-29 | Allied Healthcare Products, Inc. | Electronic suction regulator |
US5857485A (en) * | 1989-10-27 | 1999-01-12 | Perkins; James T. | Pneumatic controls for ophthalmic surgical system |
US5979494A (en) * | 1989-10-27 | 1999-11-09 | Bausch & Lomb Surgical, Inc. | Pneumatic controls for ophthalmic surgical system |
US5549139A (en) * | 1989-10-27 | 1996-08-27 | Storz Instrument Company | Pneumatic controls for ophthalmic surgical system |
US5094260A (en) * | 1990-10-26 | 1992-03-10 | Alcon Surgical, Inc. | Proportional valve and pressure control system |
US5419768A (en) * | 1991-03-07 | 1995-05-30 | Aeros Instruments, Inc. | Electrical medical vacuum regulator |
US5230625A (en) * | 1991-03-28 | 1993-07-27 | Siemens Aktiengesellschaft | Valve arrangement |
US5242404A (en) * | 1992-02-12 | 1993-09-07 | American Cyanamid Company | Aspiration control system |
US5429601A (en) * | 1992-02-12 | 1995-07-04 | American Cyanamid Company | Aspiration control system |
US5520652A (en) * | 1992-11-04 | 1996-05-28 | Medical Instrument Development Laboratories, Inc. | Methods and apparatus for control of vacuum and pressure for surgical procedures |
US5354268A (en) * | 1992-11-04 | 1994-10-11 | Medical Instrument Development Laboratories, Inc. | Methods and apparatus for control of vacuum and pressure for surgical procedures |
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